🎉 Initial commit

animation/bounce.go

@@ -0,0 +1,105 @@
+package animation
+
+import (
+	"fmt"
+	"strings"
+)
+
+// BounceAnimation 弹跳动画
+type BounceAnimation struct {
+	BaseAnimation
+	Property    string // 要变换的属性（如 y, transform 等）
+	From        string // 起始值
+	To          string // 结束值
+	BounceCount int    // 弹跳次数
+}
+
+// NewBounceAnimation 创建一个弹跳动画
+func NewBounceAnimation(targetID string, property string, from, to string, bounceCount int, duration float64, repeatCount int) *BounceAnimation {
+	return &BounceAnimation{
+		BaseAnimation: BaseAnimation{
+			Type:        Bounce, // 弹跳动画类型
+			Duration:    duration,
+			RepeatCount: repeatCount,
+			Delay:       0,
+			TargetID:    targetID,
+			Attributes:  make(map[string]string),
+		},
+		Property:    property,
+		From:        from,
+		To:          to,
+		BounceCount: bounceCount,
+	}
+}
+
+// GenerateSVG 生成弹跳动画的SVG代码
+func (a *BounceAnimation) GenerateSVG() string {
+	var sb strings.Builder
+
+	// 创建animateTransform元素，使用transform属性
+	if a.Property == "transform" {
+		sb.WriteString(fmt.Sprintf("<animateTransform href=\"#%s\" attributeName=\"transform\" type=\"translate\" ", a.TargetID))
+		sb.WriteString(fmt.Sprintf("from=\"%s\" to=\"%s\" ", a.From, a.To))
+	} else {
+		sb.WriteString(fmt.Sprintf("<animate href=\"#%s\" attributeName=\"%s\" ", a.TargetID, a.Property))
+		sb.WriteString(fmt.Sprintf("from=\"%s\" to=\"%s\" ", a.From, a.To))
+	}
+
+	sb.WriteString(fmt.Sprintf("dur=\"%gs\" ", a.Duration))
+
+	// 生成弹跳效果的关键帧
+	var keyTimes, values []string
+	step := 1.0 / float64(a.BounceCount*2)
+
+	for i := 0; i <= a.BounceCount*2; i++ {
+		// 调整关键帧时间，使动画更加平滑
+		keyTime := float64(i) * step
+		// 为每个弹跳周期添加额外的中间帧
+		if i > 0 && i < a.BounceCount*2 {
+			keyTime = keyTime + (step * 0.1) // 稍微延长每次弹跳的时间
+		}
+		keyTimes = append(keyTimes, fmt.Sprintf("%.3f", keyTime))
+
+		if i%2 == 0 {
+			values = append(values, a.From)
+		} else {
+			values = append(values, a.To)
+		}
+	}
+
+	// 添加关键帧属性
+	sb.WriteString(fmt.Sprintf("values=\"%s\" ", strings.Join(values, ";")))
+	sb.WriteString(fmt.Sprintf("keyTimes=\"%s\" ", strings.Join(keyTimes, ";")))
+
+	// 添加缓动函数
+	sb.WriteString("calcMode=\"spline\" ")
+	sb.WriteString("keySplines=\"")
+	for i := 0; i < len(values)-1; i++ {
+		if i > 0 {
+			sb.WriteString(";")
+		}
+		if i%2 == 0 {
+			// 快速上升
+			sb.WriteString("0.2 0 0.8 1")
+		} else {
+			// 缓慢下落
+			sb.WriteString("0.2 0.8 0.8 1")
+		}
+	}
+	sb.WriteString("\" ")
+
+	if a.RepeatCount < 0 {
+		sb.WriteString("repeatCount=\"indefinite\" ")
+	} else if a.RepeatCount > 0 {
+		sb.WriteString(fmt.Sprintf("repeatCount=\"%d\" ", a.RepeatCount))
+	}
+
+	if a.Delay > 0 {
+		sb.WriteString(fmt.Sprintf("begin=\"%gs\" ", a.Delay))
+	}
+
+	// 添加fill属性
+	sb.WriteString("fill=\"freeze\" />")
+
+	return sb.String()
+}